Hello Everyone, I've been reading through this post with hopes to help me and my son's car solve a current issue with the Limp More (2007 Ion 2.4L 125k miles). Started happening in the last month, and appears to go into the mode if he's short on oil. Once he fills, it runs ok. I'm intrigued to determine what is triggering the limp mode due to lack of a quart of oil. Has anyone seen this issue and provide an insight?

It's not going to matter very much longer if you keep driving with one quarter of the oil missing. Probably an unhappy sensor that reacts to the way the engine is vibrating when it is low on oil if that is even the cause.

1)Suspect exhaust restriction, put vacuum gage on manifold vac port, not ported vacuum if there is a restriction it will be obvious, use a normal car to get your baselines if not familiar with this method.
2)Put yer reader on her and observe data, is inj pulse width increasing with throttle input? What codes are present AFTER clearing all the old codes? Record and keep those!
3)Thirdly, lets take it all off the table, using an oil can for safety concerns ,spray gas into TB whilst increasing throttle, did externally supplied fuel increase rpm's normally? It's either the lack of proper orders OR a restriction if there are no codes present IMHO.